RTF malware analysis — malicious · 00637665be6baa60

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-11-05

MD5: 5f6eb7b881ed02ede4f7f140d14b81e8 SHA-1: 76d7084a19b1524d52af7d94caf27cb60164739e SHA-256: 00637665be6baa6067fb484e045ef6179b1e1f14ef925369184a45ca0888471d

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This RTF document exploits CVE-2017-0199 via an OLE object to fetch a secondary exploit from http://192.168.137.158/exploit.html. The embedded OLE object and automatic linking indicate an attempt to execute remote content, likely leading to further stages of infection.

Heuristics 6

CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199

RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://192.168.137.158/exploit.html In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000105.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x105	2724 bytes
SHA-256: `dfb495c3d86e3016386314972741253791f3ced0c376ce2b0081f96f8e6dc04c`

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